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system.go
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system.go
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/*
* Copyright The OpenTelemetry Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package stats
import (
"fmt"
"runtime"
"time"
"github.com/dustin/go-humanize"
)
// SystemProbe is a probe that measures CPU and memory usage.
type SystemProbe struct {
LastTime time.Time // last time the probe was reset
LastMalloc uint64 // last observed number of malloc
LastTotalAlloc uint64 // last observed number of total bytes allocated
LastNumGC uint32 // last observed number of garbage collections
}
// CpuMemUsage contains the CPU and memory usage of a specific step.
type CpuMemUsage struct {
Heap uint64 // heap memory usage in bytes
Malloc uint64 // number of malloc
Bandwidth float64 // memory bandwidth in B/s
GcCount uint32 // number of garbage collections
}
func NewSystemProbe() *SystemProbe {
return &SystemProbe{}
}
func (sp *SystemProbe) Reset() {
runtime.GC()
sp.LastTime = time.Now()
// Read memory stats and get the number of GCs
var m runtime.MemStats
runtime.ReadMemStats(&m)
sp.LastMalloc = m.Mallocs
sp.LastTotalAlloc = m.TotalAlloc
sp.LastNumGC = m.NumGC
}
func (sp *SystemProbe) MeasureUsage() *CpuMemUsage {
var m runtime.MemStats
runtime.ReadMemStats(&m)
durationSec := time.Now().Sub(sp.LastTime).Seconds()
return &CpuMemUsage{
Heap: m.Alloc,
Malloc: m.Mallocs - sp.LastMalloc,
Bandwidth: float64(m.TotalAlloc-sp.LastTotalAlloc) / durationSec,
GcCount: m.NumGC - sp.LastNumGC,
}
}
func (u *CpuMemUsage) ToString() string {
malloc, unitPrefix := humanize.ComputeSI(float64(u.Malloc))
return fmt.Sprintf("Heap{%s, %6.2f%s mallocs, bw=%s/s, #gc=%2d}",
humanize.Bytes(u.Heap), malloc, unitPrefix, humanize.Bytes(uint64(u.Bandwidth)), u.GcCount)
}